Medical Dictionary

risorius

noun ri·so·ri·us \ri-ˈsōr-ē-əs, -ˈzr-\
plural -rii \-ē-ˌī\

Medical Definition of RISORIUS

:  a narrow band of muscle fibers arising from the fascia over the masseter muscle, inserted into the tissues at the corner of the mouth, and acting to retract the angle of the mouth

Browse

July 29, 2015
indomitable Hear it
incapable of being subdued or conquered
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears